Hey all,

I'm now reading into the inner workings of FPGAs to better understand how
they work. The look up table seems to be the most confusing part for me.

1. I don't really understand what it IS or what it DOES. Can anyone please
explain? I know a logic cell in a Spartan 3e FPGA, for example, contains a =
3
input LUT and a DFF, but I don't understand what the LUT does or what it's
made of (gate wise).

2. Does the LUT itself provide the logic functionality? As in AND, OR, XOR,
NOT, whatever gates? If so, where are the inputs to the gates, and what are
the LUT inputs for?

3. What kind of "function" can LUTs provide?

I've searched around but can't find many answers on the Internet.
--=20
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